JOINT FLEET MAINTENANCE MANUAL

COMFLTFORCOMINST 4790.3 REV A CH-3
d. Time raising each periscope and mast at the maximum depth and speed for which they are designed.
Check training feature where applicable.
e. Run and observe air conditioning plants throughout trials noting deficiencies and to demonstrate ability
to carry entire maximum existing ship's air conditioning load or 100 percent capacity.
NOTES
1. Deep dive should be conducted using moderate speed and constantly adjusting trim, at depths specified in
reference (i), to maintain neutral buoyancy. Moderate speed shall be defined as that range of speed that allows the
ship to recover from a loss of stern plane control or flooding casualty.
2. In the execution of any Sea Trial, whether escorted or not, submarine COs are reminded of their responsibility to
communicate with the escorts and/or shore authorities within the prescribed, previously agreed upon time limits to
avoid initiation of lost submarine procedures.
3. Compare all depth and pressure gages; check operation of planes and rudder in all modes. Depth and pressure
gages should be checked as soon as each next specified depth is reached.
4. Integrity of torpedo tubes, launchers or signal ejectors shall be established by admitting sea pressure through
equalizing lines or flooding connection and the muzzle doors operated before conducting operational tests. Shoot
waterslugs from specified torpedo tubes, launchers or signal ejectors, at specified depths, as required by Class/Ship
Deep Dive Test, down to ship/torpedo tube, launcher or signal ejector limiting depth, whichever is less. Shoot
pyrotechnics from signal ejectors or launchers on initial tightness dive and at test depth on the deep dive.
5. At maximum safe speed, operate the rudder and planes through full throw in both directions in normal and
emergency power.
6. Run full power submerged for at least two hours. Operate at minimum non-cavitating depth but not to exceed
400 feet (SSN 688 Class may exceed 400 feet, as required, consistent with the submerged operating envelope but
not to exceed one-half test depth plus 50 feet). Water depth is not limited for this event.
7. The required sequence of events is initial dive, deep dive, full power run submerged, then high speed
maneuverability and steep angle tests. Initial high speed ship control tests, steep angle tests and exercises at major
casualties shall be conducted in water that does not exceed one and one-half times design test depth (which equates
to collapse depth). In every instance where the Maximum Authorized Operating Depth is exceeded, a report shall be
made in accordance with reference (j), paragraphs 3.10 and 3.26 through 3.28.
8. The submerged full power ahead test for commissioned nuclear powered submarines shall be terminated by a
back emergency bell. The duration of the back emergency bell shall be limited to 45 seconds, to be followed
immediately by an appropriate ahead bell. Caution must be exercised to avoid stern way.
I-6D-3